Coal-mining machine.



J. S. WALLACE.

COAL Mmme MACHINE.

APPLICATION FILED AUG.5, 19H).

, 1,159,302. Patented Nov. 2, 1.915,

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.I. S. WALLACE.

COAL MINING MACHINE. APPLICATION FILED AUG-5. 1M5.

Patented Nov. 2, 1915.

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JAMES s. WALLACE, or IAEGER, Wnsrvmonvm.

GOAL-MINING MACHINE.

Application filed August 5, 1915. Serial Ive/eases.

' To all whom it may concern:

Be it known thatI, JAMES S. WALLACE, a citizen of the United States, resident of Iaeger, in the county of McDowell and State of West Virginia, have made a certain new and useful Invention in Coal-Mining Ma--" chines; and I declare-the following-to be a full, clear,'andexact description'ofthe same, such as will enable othersfskilled in the art to which it appertains to make and use the invention, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon,

which form a part of this specification.

" Figure 1 is a side view of the; invention.

Fig. 2 is a plan view of the. same. Fig. 3

is a section on the line 83, Fig. 1. Fig. 4.

is a section on the line 4 4, Fig. 3. 1 Fig. 5

is a detail perspective view of oneofthe saw teeth. Fig. 6 is a detail front view of the same.

The invention has relation to coal mining machines, designed particularly for use in the mining of the richer and softer grades of bituminous coal, having for its object, in so far as possible, to avoid breaking the coal and to produce a high percentage of.

coarse lump coal.

The invention co'nsists'in the novel construction and combinations of parts, as'hereinafter set forth.

In the accompanying drawings, illustrating the invention, the numeral 2 designates a coal mining car, and 3 is a platform. usually of heavy piping in skeleton form,

carried by four steel posts or standards 6, 6, threaded elbows or corners 7,7 of 521-16.

' platform engaging threads of. said standards. r

Located upon the platform are a plurality of tubular drills 8, 8, usually two in number and having at their outer or cutting ends each an annular series of saw teeth 9, acting in the rotation of the drill to cut a cylindrical core in the seam of coal. The drills have rotary bearings in extensions 10, 10, the rear extension 10 forming part of a carriage 11, slidable in guides of the platform and carrying therewith the tubular drills, which are moved forward and back, usually by the operator. As the tubu-v lar drills are moved forward they are turned by means of a pinion 13, engaging spur gears 14, 14 of the drills, the shaft 13 of said pinion being mounted upon the car- Spec ificationof Letters Patent.

riage and turned by a driving connection Patented Nov. 2, 1915.-

15 with the shaft 16 of a suitable motor 16,

also mounted upon the carriage.

In order to maintain the core in a hori-" zontal position until the coreis cut com.- pletely and the drill withdrawmfa center auger 19, having a. driving connection 19 with the shaft 13 is provided for each drill, said auger being surrounded by smooth cylindrical sleeve 20, except at its outer or b1t end'21,'to avoidfrictional contact ofthe twist of the anger with the coal.

being located within the drill, betwee'n the disks. In'this way, as the drill is fed to vThe sleeve is carried by inner and outer disks 22, 22, the inner disk being station ary w thin the drill, and a spiral spring 23' the 00211 n he center auger bores M11016;

which is-of about the'diameter of the sleeve, the outer movable disk will move back and the'spiral spring will be compressed or put under tension. The outer movable diskis preferably cup-shaped, to engage and cover therear end of the core of coal, the spring holdlng the cup disk securely over the core end and protecting the same against disintegration. Then, when the core is completely cut, and the drill withdrawn, the spring, 7

pressing against the-outer end of the core, will preventits withdrawal withthe drill The drill being now completely withdrawn,

the core will fall at its outer end the width of the saw kerf, about of one inch, and I v break fromth'e'coal mass or seam at its inner end." The expansion of the spring will expelall loose material'from the drill. The' tubular drills, the centeraugers and the" drivingconnectionsall move together forl ward and back with the"carriage"as the drills and augers are fed to the work and The chain is turned usually by hand, and

will thereby turn the sprocket wheels and cause the screw standards to first move downwardly until they strike the ground, wherein they will become seated at their pointed so T lower ends, after which the platform 3 will move upwardly upon said standards, owing to the threaded elbows or corners 7 of said platform engagingthe standards. The platform and the drills are in this way elevated to the desired degree, to accord with the thickness of the coal seam, when the movement of the chain is stopped and the platform comes to rest. lowered by movement of the chain reversely.

The saw "teeth 9 are designed tobe made removable in any suitable way, and are provided with flaring or tapered channels 27, to throw the coal saw dust to the outside of the tubular drill, exterior spiral grooves 28 of the tubular drills carrying said dust backwardly, out of the way.

I claim: v

1. A coal mining machine, comprising a tubular drill having an annular series of saw teeth, a center auger for said drill, and a tubular casing for said auger.

2. A coal mining machine, comprising a tubular drill-having an annular series of saw teeth, and a center auger for said drill, said teeth being adapted to throw the coal dust outwardly and said drill having an exterior dust-conveying groove.

3. A coal mining machine, comprising a tubular drill having an annular series of saw teeth, a center augerfor said drill, a

tubular casing for said auger, an outer mov able disk in said drill, and av coiled spring in said drill between said movable disk and the rear end of the drill.

4. A coal mining machine, comprising a tubular drill having an annular series of saw teeth, a center auger for said drill, a tubular casing for said auger, an outer movable cup-shaped disk in said drill, a rear stationary disk, and a coiled spring between the disks.

' 5. A coal mining machine, comprising a tubular drill having an annular series of saw teeth, and a center auger for said drill, said teeth having flaring channels designed to throw the coal dust outwardly, and said The platform may be drill having an exterior spiral dust-convey- 111g groove.

6. A coal mining machine, comprising a platform having an upward extension, a carriage movable in guides of said platform and having an upward extension, tubular drills having rotary bearings in the exten sion of said carriage and slidably engaging the extension of said platform, a center auger for each drill, and driving means upon the carriage for said drills and for said augers.

'7. A coal mining machine, comprising a platform having an upward extension, a ca r-- riage movable in guides of said platform and having an upward extension, tubular drills carried by and having rotary bearings in the extension of said carriage and slidably engaging the extension of said platform, a center auger for each drill, driving Ineans upon the carriage for said drills and for said augers, and means for adjusting the platform and carriage vertically, comprising four corner posts having threaded engagement with said platform, sprocket wheels resting upon said platform and having .a rotatably fast slidable engagement with said posts, .and an endless sprocket chain engaging said wheels.

8. In a coal mining machine, a, platform having an upward extension, a carriage movable in guides of said platform and having an upward extension, tubular drills carried by and having rotary bearings in the exten sion of said carriage and slidably engaging the extension of said platform, a center auger for each drill, driving means upon the carriage for said drills and for said angers, and means for adjusting the platform and carriage vertically.

In testimony whereof I affix my signature, in presence of two witnesses.

JAMES s. WALLACE.

Witnesses J. S. MCKINNY, J. B. SNYDER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

